Would check the plugs for signs of corrosion as well.
The exhaust passages should be soot black, no corrosion whatsoever. The fact that youve got corrosion in there, means you have excessive moisture, which means the exhaust valves are corroding as well, which ultimately is what gets you...
Had the same thing on my 7.4 mpi. See pics below. Test your oil for sodium and do a compression check. Betting you have lower compression toward the stern as water runs downhill. Manifolds are shot and they're aftermarket to boot. The ones in the pictures were also aftermarket. Porous Chinese...
I agree with ttmott in terms of what should be done here, with the addition (and I suspect ttmott would agree here as well) that you really at this point want to drill out the 4 bolt holes, fill them with epoxy and redrill. This era 340 does not have a cored hull, so it should be solid glass...
I have a thread on this. A prefab exhaust tube is glassed perpendicular into the hull and the underwater exhaust port is through bolted on the outside of the hull. I had water and exhaust leaking in between the outside of the tube and the hull and then running down the engine stringers and into...
The IPS drives are more prevalent and have a larger network of servicers, but they have their downsides as well. As an example, the IPS circulates drive oil through the drive AND transmission. You take on water through the drive, and it takes out drive and transmission. The Zeus pods have...
Pods are like a 5 year old European sports sedan with an 8 cylinder twin turbo, with 60,000 miles on it. When they work, they are an absolute joy to drive, but they require at least twice the maintenance of a regular car, and when they break it can get expensive quickly.
An example. I own a...
I've done this and the folks on here are correct. You have to buy the sensor kit and to install that, haul the boat, etc.
Buy this: https://www.mente-marine.com/
Replaces the switches at the helm. Run the setup procedure and you'll have both tab position and auto tab functionality. It's...
I should add that another cause of the clutch pack locking up is water in the transmission fluid so check for that as well. Given the age of your boat, unless you've had the transmission coolers done previously, if you're going to replace the transmission, the oil cooler should be replaced as...
Yes. If it's stuck in gear, your clutch discs are warped to the point that they cannot separate and the transmission will not go into neutral. Have the trannie oil tested by Blackstone. It will in all likelihood be full of the material making up the clutch discs, which if I recall correctly...
Did you ever do the measurements called for in the install manual to see whether everything was sufficiently above the water line with the correct down angles?